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  #61  
Old 02-06-2012, 10:52 AM
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Any tricks for trying to de-scale a used heater core? Is muriatic acid the way to go, or a big no-no?
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  #62  
Old 02-06-2012, 10:54 AM
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I took mine to a radiator shop and let them clean it up - around $40 IIRC. Not sure what they did though....
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  #63  
Old 02-06-2012, 11:01 AM
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Yeah, a radiator shop with a "hot tank" is the ticket. I had a shop do mine years ago for like $25.
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  #64  
Old 02-06-2012, 11:06 AM
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I did the muriatic acid treatment. Just have to make sure it doesn't come in contact with your skin, eyes (wear goggles like in chemistry class), or anything other than the copper tubes, especially aluminum and I think concrete. Also remember that you typically want to add acid to water (if diluting), not the other way around.
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  #65  
Old 02-06-2012, 01:04 PM
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Quote:
Originally Posted by subzali View Post
I did the muriatic acid treatment. Just have to make sure it doesn't come in contact with your skin, eyes (wear goggles like in chemistry class), or anything other than the copper tubes, especially aluminum and I think concrete. Also remember that you typically want to add acid to water (if diluting), not the other way around.
All good advice! Muratic is pretty mild but it is still acid! Another huge precaution when using acid on anything your trying to dissolve is the vapors being created are usually not mammal lung and/or eye friendly!
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  #66  
Old 02-06-2012, 01:38 PM
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Yes, muriatic acid burns the lungs/nose. Be careful!
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Last edited by subzali; 02-06-2012 at 03:12 PM.
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  #67  
Old 02-06-2012, 02:19 PM
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Sounds good.
I was trying to avoid taking the core to a radiator shop as mine has the nice foam wrap around the outside that I imagine would be destroyed by the tanking process at the radiator shop.

Matt, was your cleaning effective? Did you have to dilute your stock acid?
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  #68  
Old 02-06-2012, 03:10 PM
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TJ, I don't think mine was too dirty to begin with, so can't say how effective it was. The tubes are squeaky clean right now though, I can tell you that. My heating issues are coming from elsewhere, some kind of flow restriction in the hoses or control valve or something.

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  #69  
Old 02-06-2012, 04:37 PM
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I filled a '77 heater core with straight Muriatic acid (pour slowly and carefully, wear goggles), waited about 1/2 hour for the bubbling to stop, then rinsed the core thoroughly in bucket of water into which I had put a couple tablespoons of baking soda. I then rinsed the core with more clean water. It was completely clean (no scale inside) and ran very hot in my truck. No leaks, either. The full-strength acid had enough power to dissolve all the scale in a reasonable amount of time. I would not dilute it.
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Old 02-06-2012, 06:21 PM
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Quote:
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I filled a '77 heater core with straight Muriatic acid (pour slowly and carefully, wear goggles), waited about 1/2 hour for the bubbling to stop, then rinsed the core thoroughly in bucket of water into which I had put a couple tablespoons of baking soda. I then rinsed the core with more clean water. It was completely clean (no scale inside) and ran very hot in my truck. No leaks, either. The full-strength acid had enough power to dissolve all the scale in a reasonable amount of time. I would not dilute it.
Full strength consumer available Muratic acid is only usually 10-12%. I use it to clean the build up of cl2 salts out of chlorinating equipment.
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